abolitionist—A person who believed that slavery should be outlawed.
congressman—A person elected to represent a group of people in government.
The Fugitive Slave Acts—Acts that made it against the law to help runaway slaves.
ice floes—Pieces of ice that have broken away from a frozen lake or river.
mob—A rough and violent group of people.
network—A group of people who are connected or work with one another in some way.
route—A system of roads to be followed to get from one place to another.
steamer—A boat powered by steam.
symbol—Something that stands for something else.
torture—Brutal treatment meant to cause extreme pain.